1/4 #GI #GIbleed #urea Elevated BUN: creatinine ratio favors UPPER over lower GI bleed. Why? 1) Hb in stomach --> amino acids (aa). 2

1/4 #GI #GIbleed #urea Elevated BUN: creatinine ratio favors UPPER over lower GI bleed. Why? 1) Hb in stomach --> amino acids (aa). 2